'Hayakawa Serina' is having a happy marriage with her husband alone. She attends a yoga class on the advice of her husband. Then one day, she started a private class at the suggestion of a yoga instructor, Kawaguchi. However, during class, Kawaguchi forcibly violates Serina, and by recording a video of it, threatens her and forces her to respond to her demands. Serena, who was unable to tell her husband about this situation, was forced to accept his request, and Kawaguchi, who is unfamiliar with the situation, comes to Serina's house to attend a business trip class...